x1,y1,x2,y2 = map(float,input().split())
distance = ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) 
print('{}'.format(distance)) x1,y1,x2,y2 = map(float,input().split()) x1 map(float,input().split()) map float input().split() ().split () input split y1 x2 y2 distance = ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) distance ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) (x1 - x2)**2 + (y1 - y2)**2 (x1 - x2)**2 x1 - x2 x1 x2 2 (y1 - y2)**2 y1 - y2 y1 y2 2 1/2 1 2 print('{}'.format(distance)) print '{}'.format(distance) '{}'.format '{}' format distance y1,x2,y2 = map(float,input().split()) map(float,input().split()) y1 x2,y2 = map(float,input().split()) map(float,input().split()) x2 x1,y1,x2,y2 = map(float,input().split()) map(float,input().split()) x1 distance = ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) distance y2 = map(float,input().split()) map(float,input().split()) y2
x1,y1,x2,y2 = map(float,input().split())
distance = ( (x1 - x2)**2 + (y1 - y2)**2 )**(1/2) 
print('{}'.format(distance))
